/*
 * Copyright (c) 1983-2023 Trevor Wishart and Composers Desktop Project Ltd
 * http://www.trevorwishart.co.uk
 * http://www.composersdesktop.com
 *
 This file is part of the CDP System.

 The CDP System is free software; you can redistribute it
 and/or modify it under the terms of the GNU Lesser General Public
 License as published by the Free Software Foundation; either
 version 2.1 of the License, or (at your option) any later version.

 The CDP System is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU Lesser General Public License for more details.

 You should have received a copy of the GNU Lesser General Public
 License along with the CDP System; if not, write to the Free Software
 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 02111-1307 USA
 *
 */



#include <stdio.h>
#include <stdlib.h>
#include <structures.h>
#include <tkglobals.h>
#include <pnames.h>
#include <filetype.h>
#include <processno.h>
#include <modeno.h>
#include <logic.h>
#include <globcon.h>
#include <cdpmain.h>
#include <math.h>
#include <mixxcon.h>
#include <osbind.h>
#include <standalone.h>
#include <ctype.h>
#include <sfsys.h>
#include <string.h>
#include <srates.h>

#define SIGNAL_TO_LEFT  (0)
#define SIGNAL_TO_RIGHT (1)
#define ROOT2        (1.4142136)

#define DEG90    (PI/2.0)
#define DEG45    (PI/4.0)
#define DEG22    (PI/8.0)            //    Actually 22.5 degrees
#define DEG67    ((3.0 * PI)/8.0)    //    Actually 67.5 degrees
#define DEG135    ((3.0 * PI)/4.0)

#define TR_MIN_GAIN (0.000016)

#ifdef unix
#define round(x) lround((x))
#endif

char errstr[2400];

int anal_infiles = 1;
int    sloom = 0;
int sloombatch = 0;

const char* cdp_version = "7.1.0";

//CDP LIB REPLACEMENTS
static int setup_transit_application(dataptr dz);
static int parse_sloom_data(int argc,char *argv[],char ***cmdline,int *cmdlinecnt,dataptr dz);
static int parse_infile_and_check_type(char **cmdline,dataptr dz);
static int setup_transit_param_ranges_and_defaults(dataptr dz);
static int handle_the_outfile(int *cmdlinecnt,char ***cmdline,dataptr dz);
static int open_the_outfile(dataptr dz);
static int setup_and_init_input_param_activity(dataptr dz,int tipc);
static int setup_input_param_defaultval_stores(int tipc,aplptr ap);
static int establish_application(dataptr dz);
static int initialise_vflags(dataptr dz);
static int setup_parameter_storage_and_constants(int storage_cnt,dataptr dz);
static int initialise_is_int_and_no_brk_constants(int storage_cnt,dataptr dz);
static int mark_parameter_types(dataptr dz,aplptr ap);
static int assign_file_data_storage(int infilecnt,dataptr dz);
static int get_tk_cmdline_word(int *cmdlinecnt,char ***cmdline,char *q);
static int get_the_process_no(char *prog_identifier_from_cmdline,dataptr dz);
static int get_the_mode_from_cmdline(char *str,dataptr dz);
static int setup_and_init_input_brktable_constants(dataptr dz,int brkcnt);

static int transit(dataptr dz);
static void pancalc(double position,double *leftgain,double *rightgain);
static int transit_param_preprocess(dataptr dz);
static int store_the_filename(char *filename,dataptr dz);
static int store_the_further_filename(int n,char *filename,dataptr dz);
static int get_position(double *thispos,int *spkr1,int *spkr2,double linear_steplen,int n,double *distance_to_centre,
                        double first_quadrant,double second_quadrant,int *on_2nd_pair,int *on_3rd_pair,dataptr dz);
static int insert_sounds(int *snd,dataptr dz);
static int calc_filters(double *balance,int *spkr,dataptr dz);
static void leftwards(double *pos, double *time, double *level, int *spkr, dataptr dz);
static int ReorientData(double *pos, double *time, double *level, int *spkr, dataptr dz);
static int check_transit_param_validity_and_consistency(dataptr dz);
static int read_input_sndfiles_list(char *filename,dataptr dz);
static int allocate_the_filespace(dataptr dz);

/**************************************** MAIN *********************************************/

int main(int argc,char *argv[])
{
    int exit_status;
    dataptr dz = NULL;
    char **cmdline;
    int  cmdlinecnt, n;
    //aplptr ap;
    int is_launched = FALSE;
    if(argc==2 && (strcmp(argv[1],"--version") == 0)) {
        fprintf(stdout,"%s\n",cdp_version);
        fflush(stdout);
        return 0;
    }
    /* CHECK FOR SOUNDLOOM */
    if((sloom = sound_loom_in_use(&argc,&argv)) > 1) {
        sloom = 0;
        sloombatch = 1;
    }
    if(sflinit("cdp")){
        sfperror("cdp: initialisation\n");
        return(FAILED);
    }
    /* SET UP THE PRINCIPLE DATASTRUCTURE */
    if((exit_status = establish_datastructure(&dz))<0) {                    // CDP LIB
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    if(!sloom) {
        if(argc == 1) {
            usage1();
            return(FAILED);
        } else if(argc == 2) {
            usage2(argv[1]);
            return(FAILED);
        }
    }
    if(!sloom) {
        if((exit_status = make_initial_cmdline_check(&argc,&argv))<0) {        // CDP LIB
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
        cmdline    = argv;
        cmdlinecnt = argc;
        if((get_the_process_no(argv[0],dz))<0)
            return(FAILED);
        cmdline++;
        cmdlinecnt--;
        dz->maxmode = 5;
        if((exit_status = get_the_mode_from_cmdline(cmdline[0],dz))<0) {
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(exit_status);
        }
        cmdline++;
        cmdlinecnt--;
        // setup_particular_application =
        if((exit_status = setup_transit_application(dz))<0) {
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
        if((exit_status = count_and_allocate_for_infiles(cmdlinecnt,cmdline,dz))<0) {        // CDP LIB
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
        if(dz->process == TRANSITF) {
            if(cmdlinecnt < 9) {
                fprintf(stderr,"Insufficient parameters for this process.\n");
                return(FAILED);
            }
        } else if(dz->process == TRANSITFD) {
            if(cmdlinecnt < 11) {
                fprintf(stderr,"Insufficient parameters for this process.\n");
                return(FAILED);
            }
        }
    } else {
        //parse_TK_data() =
        if((exit_status = parse_sloom_data(argc,argv,&cmdline,&cmdlinecnt,dz))<0) {
            exit_status = print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(exit_status);
        }
    }
    //ap = dz->application;

    // parse_infile_and_hone_type() =
    if((exit_status = parse_infile_and_check_type(cmdline,dz))<0) {
        exit_status = print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    // setup_param_ranges_and_defaults() =
    if((exit_status = setup_transit_param_ranges_and_defaults(dz))<0) {
        exit_status = print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    dz->all_words = 0;
    dz->ifd[0] = -1;
    switch(dz->process) {
    case(TRANSITL):
        if((exit_status = read_input_sndfiles_list(cmdline[0],dz))<0) {
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
        cmdlinecnt--;
        cmdline++;
        break;
    case(TRANSIT):
        // open_first_infile        CDP LIB
        if((exit_status = open_first_infile(cmdline[0],dz))<0) {
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
        if((exit_status = store_the_filename(cmdline[0],dz))<0)
            return(exit_status);
        cmdlinecnt--;
        cmdline++;
        break;
    default:
        if((exit_status = open_first_infile(cmdline[0],dz))<0) {
            print_messages_and_close_sndfiles(exit_status,is_launched,dz);
            return(FAILED);
        }
        if((exit_status = store_the_filename(cmdline[0],dz))<0)
            return(exit_status);
        cmdlinecnt--;
        cmdline++;
        for(n=1;n<dz->infilecnt;n++) {
            if((exit_status = handle_other_infile(n,cmdline[0],dz))<0) {
                sprintf(errstr,"Possibly too many parameters on commandline, or bad flag.\n");
                print_messages_and_close_sndfiles(exit_status,is_launched,dz);
                return(FAILED);
            }
            sndcloseEx(dz->ifd[n]);
            dz->ifd[n] = -1;
            if((exit_status = store_the_further_filename(dz->all_words,cmdline[0],dz))<0)
                return(exit_status);
            cmdlinecnt--;
            cmdline++;
        }
        break;
    }
    if(dz->ifd[0] >= 0) {
        sndcloseEx(dz->ifd[0]);
        dz->ifd[0] = -1;
    }
    exit_status = FINISHED;
    switch(dz->process) {
    case(TRANSITF):     if(dz->infilecnt != 2)    exit_status = FAILED;    break;
    case(TRANSITD):     if(dz->infilecnt < 2)    exit_status = FAILED;    break;
    case(TRANSITFD): if(dz->infilecnt < 4)    exit_status = FAILED;    break;
    case(TRANSITS):
    case(TRANSITL):
        if(dz->infilecnt < 3 || EVEN(dz->infilecnt)) {
            fprintf(stdout,"ERROR: On odd number ( >=3 ) of soundfiles required for this process.\n");
            fflush(stdout);
            return(FAILED);
        }
    }
    if(exit_status == FAILED) {
        fprintf(stdout,"ERROR: Wrong number of input soundfiles for this process.\n");
        fflush(stdout);
        return(FAILED);
    }
    //    handle_extra_infiles() : redundant
    // handle_outfile() =
    if((exit_status = handle_the_outfile(&cmdlinecnt,&cmdline,dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }

    //    handle_formants()            redundant
    //    handle_formant_quiksearch()    redundant
    //    handle_special_data()        redundant

    if((exit_status = read_parameters_and_flags(&cmdline,&cmdlinecnt,dz))<0) {        // CDP LIB
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    //    check_param_validity_and_consistency()        redundant
    if((exit_status = check_transit_param_validity_and_consistency(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    is_launched = TRUE;
    //    create_sndbufs())        redundant
    if((exit_status = transit_param_preprocess(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    if((exit_status = open_the_outfile(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    //spec_process_file =
    if((exit_status = transit(dz))<0) {
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    if((exit_status = complete_output(dz))<0) {                                        // CDP LIB
        print_messages_and_close_sndfiles(exit_status,is_launched,dz);
        return(FAILED);
    }
    exit_status = print_messages_and_close_sndfiles(FINISHED,is_launched,dz);        // CDP LIB
    free(dz);
    return(SUCCEEDED);
}

/**********************************************
        REPLACED CDP LIB FUNCTIONS
**********************************************/


/****************************** SET_PARAM_DATA *********************************/

int set_param_data(aplptr ap, int special_data,int maxparamcnt,int paramcnt,char *paramlist)
{
    ap->special_data   = (char)special_data;
    ap->param_cnt      = (char)paramcnt;
    ap->max_param_cnt  = (char)maxparamcnt;
    if(ap->max_param_cnt>0) {
        if((ap->param_list = (char *)malloc((size_t)(ap->max_param_cnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for param_list\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->param_list,paramlist);
    }
    return(FINISHED);
}

/****************************** SET_VFLGS *********************************/

int set_vflgs
(aplptr ap,char *optflags,int optcnt,char *optlist,char *varflags,int vflagcnt, int vparamcnt,char *varlist)
{
    ap->option_cnt      = (char) optcnt;            /*RWD added cast */
    if(optcnt) {
        if((ap->option_list = (char *)malloc((size_t)(optcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for option_list\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->option_list,optlist);
        if((ap->option_flags = (char *)malloc((size_t)(optcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for option_flags\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->option_flags,optflags);
    }
    ap->vflag_cnt = (char) vflagcnt;
    ap->variant_param_cnt = (char) vparamcnt;
    if(vflagcnt) {
        if((ap->variant_list  = (char *)malloc((size_t)(vflagcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for variant_list\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->variant_list,varlist);
        if((ap->variant_flags = (char *)malloc((size_t)(vflagcnt+1)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY: for variant_flags\n");
            return(MEMORY_ERROR);
        }
        strcpy(ap->variant_flags,varflags);

    }
    return(FINISHED);
}

/***************************** APPLICATION_INIT **************************/

int application_init(dataptr dz)
{
    int exit_status;
    int storage_cnt;
    int tipc, brkcnt;
    aplptr ap = dz->application;
    if(ap->vflag_cnt>0)
        initialise_vflags(dz);
    tipc  = ap->max_param_cnt + ap->option_cnt + ap->variant_param_cnt;
    ap->total_input_param_cnt = (char)tipc;
    if(tipc>0) {
        if((exit_status = setup_input_param_range_stores(tipc,ap))<0)
            return(exit_status);
        if((exit_status = setup_input_param_defaultval_stores(tipc,ap))<0)
            return(exit_status);
        if((exit_status = setup_and_init_input_param_activity(dz,tipc))<0)
            return(exit_status);
    }
    brkcnt = tipc;
    //THERE ARE NO INPUTFILE brktables USED IN THIS PROCESS
    if(brkcnt>0) {
        if((exit_status = setup_and_init_input_brktable_constants(dz,brkcnt))<0)
            return(exit_status);
    }
    if((storage_cnt = tipc + ap->internal_param_cnt)>0) {
        if((exit_status = setup_parameter_storage_and_constants(storage_cnt,dz))<0)
            return(exit_status);
        if((exit_status = initialise_is_int_and_no_brk_constants(storage_cnt,dz))<0)
            return(exit_status);
    }
    if((exit_status = mark_parameter_types(dz,ap))<0)
        return(exit_status);

    // establish_infile_constants() replaced by
    dz->infilecnt = 1;
    //establish_bufptrs_and_extra_buffers():
    return(FINISHED);
}

/********************** SETUP_PARAMETER_STORAGE_AND_CONSTANTS ********************/
/* RWD mallo changed to calloc; helps debug verison run as release! */

int setup_parameter_storage_and_constants(int storage_cnt,dataptr dz)
{
    if((dz->param       = (double *)calloc(storage_cnt, sizeof(double)))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 1\n");
        return(MEMORY_ERROR);
    }
    if((dz->iparam      = (int    *)calloc(storage_cnt, sizeof(int)   ))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 2\n");
        return(MEMORY_ERROR);
    }
    if((dz->is_int      = (char   *)calloc(storage_cnt, sizeof(char)))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 3\n");
        return(MEMORY_ERROR);
    }
    if((dz->no_brk      = (char   *)calloc(storage_cnt, sizeof(char)))==NULL) {
        sprintf(errstr,"setup_parameter_storage_and_constants(): 5\n");
        return(MEMORY_ERROR);
    }
    return(FINISHED);
}

/************** INITIALISE_IS_INT_AND_NO_BRK_CONSTANTS *****************/

int initialise_is_int_and_no_brk_constants(int storage_cnt,dataptr dz)
{
    int n;
    for(n=0;n<storage_cnt;n++) {
        dz->is_int[n] = (char)0;
        dz->no_brk[n] = (char)0;
    }
    return(FINISHED);
}

/***************************** MARK_PARAMETER_TYPES **************************/

int mark_parameter_types(dataptr dz,aplptr ap)
{
    int n, m;                            /* PARAMS */
    for(n=0;n<ap->max_param_cnt;n++) {
        switch(ap->param_list[n]) {
        case('0'):    break; /* dz->is_active[n] = 0 is default */
        case('i'):    dz->is_active[n] = (char)1; dz->is_int[n] = (char)1;dz->no_brk[n] = (char)1; break;
        case('I'):    dz->is_active[n] = (char)1;    dz->is_int[n] = (char)1;                          break;
        case('d'):    dz->is_active[n] = (char)1;                            dz->no_brk[n] = (char)1; break;
        case('D'):    dz->is_active[n] = (char)1;    /* normal case: double val or brkpnt file */     break;
        default:
            sprintf(errstr,"Programming error: invalid parameter type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }                                 /* OPTIONS */
    for(n=0,m=ap->max_param_cnt;n<ap->option_cnt;n++,m++) {
        switch(ap->option_list[n]) {
        case('i'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1;    dz->no_brk[m] = (char)1; break;
        case('I'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1;                          break;
        case('d'): dz->is_active[m] = (char)1;                             dz->no_brk[m] = (char)1; break;
        case('D'): dz->is_active[m] = (char)1;    /* normal case: double val or brkpnt file */     break;
        default:
            sprintf(errstr,"Programming error: invalid option type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }                                /* VARIANTS */
    for(n=0,m=ap->max_param_cnt + ap->option_cnt;n < ap->variant_param_cnt; n++, m++) {
        switch(ap->variant_list[n]) {
        case('0'): break;
        case('i'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1;    dz->no_brk[m] = (char)1; break;
        case('I'): dz->is_active[m] = (char)1; dz->is_int[m] = (char)1;                              break;
        case('d'): dz->is_active[m] = (char)1;                             dz->no_brk[m] = (char)1; break;
        case('D'): dz->is_active[m] = (char)1; /* normal case: double val or brkpnt file */         break;
        default:
            sprintf(errstr,"Programming error: invalid variant type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }                                /* INTERNAL */
    for(n=0,
            m=ap->max_param_cnt + ap->option_cnt + ap->variant_param_cnt; n<ap->internal_param_cnt; n++,m++) {
        switch(ap->internal_param_list[n]) {
        case('0'):  break;     /* dummy variables: variables not used: but important for internal paream numbering!! */
        case('i'):    dz->is_int[m] = (char)1;    dz->no_brk[m] = (char)1;    break;
        case('d'):                                dz->no_brk[m] = (char)1;    break;
        default:
            sprintf(errstr,"Programming error: invalid internal param type in mark_parameter_types()\n");
            return(PROGRAM_ERROR);
        }
    }
    return(FINISHED);
}

/************************ HANDLE_THE_OUTFILE *********************/

int handle_the_outfile(int *cmdlinecnt,char ***cmdline,dataptr dz)
{
    char *filename = (*cmdline)[0], *p;
    if(filename[0]=='-' && filename[1]=='f') {
        dz->floatsam_output = 1;
        dz->true_outfile_stype = SAMP_FLOAT;
        filename+= 2;
    }
    if(!sloom) {
        if(file_has_invalid_startchar(filename) || value_is_numeric(filename)) {
            sprintf(errstr,"Outfile name %s has invalid start character(s) or looks too much like a number.\n",filename);
            return(DATA_ERROR);
        }
    }
    strcpy(dz->outfilename,filename);
    p = dz->outfilename;
    while(*p != ENDOFSTR) {
        if(*p == '.') {
            *p = ENDOFSTR;
            break;
        }
        p++;
    }
    strcat(dz->outfilename,".mmx");
    (*cmdline)++;
    (*cmdlinecnt)--;
    return(FINISHED);
}

/************************ OPEN_THE_OUTFILE *********************/

int open_the_outfile(dataptr dz)
{
    int exit_status;
    dz->infile->channels = 8;
    if((exit_status = create_sized_outfile(dz->outfilename,dz))<0)
        return(exit_status);
    dz->infile->channels = 1;
    return(FINISHED);
}

/***************************** ESTABLISH_APPLICATION **************************/

int establish_application(dataptr dz)
{
    aplptr ap;
    if((dz->application = (aplptr)malloc(sizeof (struct applic)))==NULL) {
        sprintf(errstr,"establish_application()\n");
        return(MEMORY_ERROR);
    }
    ap = dz->application;
    memset((char *)ap,0,sizeof(struct applic));
    return(FINISHED);
}

/************************* INITIALISE_VFLAGS *************************/

int initialise_vflags(dataptr dz)
{
    int n;
    if((dz->vflag  = (char *)malloc(dz->application->vflag_cnt * sizeof(char)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY: vflag store,\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<dz->application->vflag_cnt;n++)
        dz->vflag[n]  = FALSE;
    return FINISHED;
}

/************************* SETUP_INPUT_PARAM_DEFAULTVALS *************************/

int setup_input_param_defaultval_stores(int tipc,aplptr ap)
{
    int n;
    if((ap->default_val = (double *)malloc(tipc * sizeof(double)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY for application default values store\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<tipc;n++)
        ap->default_val[n] = 0.0;
    return(FINISHED);
}

/***************************** SETUP_AND_INIT_INPUT_PARAM_ACTIVITY **************************/

int setup_and_init_input_param_activity(dataptr dz,int tipc)
{
    int n;
    if((dz->is_active = (char   *)malloc((size_t)tipc))==NULL) {
        sprintf(errstr,"setup_and_init_input_param_activity()\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<tipc;n++)
        dz->is_active[n] = (char)0;
    return(FINISHED);
}

/************************* SETUP_TRANSIT_APPLICATION *******************/

int setup_transit_application(dataptr dz)
{
    int exit_status;
    aplptr ap;
    if((exit_status = establish_application(dz))<0)        // GLOBAL
        return(FAILED);
    ap = dz->application;
    // SEE parstruct FOR EXPLANATION of next 2 functions
    switch(dz->process) {
    case(TRANSIT):
    case(TRANSITD):
        if((exit_status = set_param_data(ap,0   ,6,5,"ddidd0"))<0)
            return(exit_status);
        if((exit_status = set_vflgs(ap,"tdem",4,"dddd","l",1,0,"0"))<0)
            return(exit_status);
        break;
    case(TRANSITF):
    case(TRANSITFD):
        if((exit_status = set_param_data(ap,0   ,6,6,"ddiddd"))<0)
            return(exit_status);
        if((exit_status = set_vflgs(ap,"tdem",4,"dddd","l",1,0,"0"))<0)
            return(exit_status);
        break;
    case(TRANSITS):
    case(TRANSITL):
        if((exit_status = set_param_data(ap,0   ,6,4,"dd0dd0"))<0)
            return(exit_status);
        if((exit_status = set_vflgs(ap,"",0,"","l",1,0,"0"))<0)
            return(exit_status);
        break;
    }
    // set_legal_infile_structure -->
    dz->has_otherfile = FALSE;
    // assign_process_logic -->
    switch(dz->process) {
    case(TRANSITL):
        dz->input_data_type = SNDLIST_ONLY;
        break;
    case(TRANSIT):
        dz->input_data_type = SNDFILES_ONLY;
        break;
    case(TRANSITF):
        dz->input_data_type = TWO_SNDFILES;
        break;
    default:
        dz->input_data_type = MANY_SNDFILES;
        break;
    }
    dz->process_type    = TO_TEXTFILE;
    dz->outfiletype      = TEXTFILE_OUT;
    return application_init(dz);    //GLOBAL
}

/************************* PARSE_INFILE_AND_CHECK_TYPE *******************/

int parse_infile_and_check_type(char **cmdline,dataptr dz)
{
    int exit_status;
    infileptr infile_info;
    if(!sloom) {
        if((infile_info = (infileptr)malloc(sizeof(struct filedata)))==NULL) {
            sprintf(errstr,"INSUFFICIENT MEMORY for infile structure to test file data.");
            return(MEMORY_ERROR);
        } else if((exit_status = cdparse(cmdline[0],infile_info))<0) {
            sprintf(errstr,"Failed to parse input file %s\n",cmdline[0]);
            return(PROGRAM_ERROR);
        }
        if(dz->process == TRANSITL) {
            if(!(infile_info->filetype & SNDLIST))  {
                sprintf(errstr,"File %s is not of correct type\n",cmdline[0]);
                return(DATA_ERROR);
            }
        } else {
            if(infile_info->filetype != SNDFILE)  {
                sprintf(errstr,"File %s is not of correct type\n",cmdline[0]);
                return(DATA_ERROR);
            } else if(infile_info->channels != 1)  {
                sprintf(errstr,"File %s is not of correct type (must be mono)\n",cmdline[0]);
                return(DATA_ERROR);
            } else if((exit_status = copy_parse_info_to_main_structure(infile_info,dz))<0) {
                sprintf(errstr,"Failed to copy file parsing information\n");
                return(PROGRAM_ERROR);
            }
        }
        free(infile_info);
    }
    return(FINISHED);
}

/************************* SETUP_TRANSIT_PARAM_RANGES_AND_DEFAULTS *******************/

int setup_transit_param_ranges_and_defaults(dataptr dz)
{
    int exit_status;
    aplptr ap = dz->application;
    // set_param_ranges()
    ap->total_input_param_cnt = (char)(ap->max_param_cnt + ap->option_cnt + ap->variant_param_cnt);
    // NB total_input_param_cnt is > 0 !!!
    if((exit_status = setup_input_param_range_stores(ap->total_input_param_cnt,ap))<0)
        return(FAILED);
    // get_param_ranges()
    if(EVEN(dz->mode)) {
        ap->lo[TRAN_FOCUS]    = 1;
        ap->hi[TRAN_FOCUS]    = 8;
        ap->default_val[TRAN_FOCUS] = 1;
    } else {
        ap->lo[TRAN_FOCUS]    = 1.5;
        ap->hi[TRAN_FOCUS]    = 8.5;
        ap->default_val[TRAN_FOCUS] = 1.5;
    }
    ap->lo[TRAN_DUR]    = dz->duration * 2.0;
    ap->hi[TRAN_DUR]    = 32767;
    ap->default_val[TRAN_DUR]    = 8;
    if(dz->process < TRANSITS) {
        ap->lo[TRAN_STEPS]    = 2;
        ap->hi[TRAN_STEPS]    = 32767;
        ap->default_val[TRAN_STEPS] = 24;
    }
    switch(dz->mode) {
    case(GLANCING):
        ap->lo[TRAN_MAXA]    = 22.5;
        ap->hi[TRAN_MAXA]    = 90;
        ap->default_val[TRAN_MAXA] = 85;
        break;
    case(EDGEWISE):
        ap->lo[TRAN_MAXA]    = 22.5;
        ap->hi[TRAN_MAXA]    = 90;
        ap->default_val[TRAN_MAXA] = 85;
        break;
    case(CROSSING):
        ap->lo[TRAN_MAXA]    = 45;
        ap->hi[TRAN_MAXA]    = 90;
        ap->default_val[TRAN_MAXA] = 85;
        break;
    case(CLOSE):
        ap->lo[TRAN_MAXA]    = 67.5;
        ap->hi[TRAN_MAXA]    = 90;
        ap->default_val[TRAN_MAXA] = 85;
        break;
    case(CENTRAL):
        ap->lo[TRAN_MAXA]    = 1;
        ap->hi[TRAN_MAXA]    = 1000;
        ap->default_val[TRAN_MAXA] = 10;
        break;
    }
    ap->lo[TRAN_DEC]    = 0;
    ap->hi[TRAN_DEC]    = 1;
    ap->default_val[TRAN_DEC] = .9;
    if(dz->process == TRANSITF || dz->process == TRANSITFD) {
        ap->lo[TRAN_FBAL]    = 0;
        ap->hi[TRAN_FBAL]    = 1;
        ap->default_val[TRAN_FBAL] = .9;
    }
    if(dz->process < TRANSITS) {
        ap->lo[TRAN_THRESH]    = 0;
        ap->hi[TRAN_THRESH]    = 1;
        ap->default_val[TRAN_THRESH] = 0.0;
        ap->lo[TRAN_DECLIM]    = 0;
        ap->hi[TRAN_DECLIM]    = 1;
        ap->default_val[TRAN_DECLIM] = 0.0;
        ap->lo[TRAN_MINLEV]    = 0;
        ap->hi[TRAN_MINLEV]    = 1;
        ap->default_val[TRAN_MINLEV] = 0.0;
        ap->lo[TRAN_MAXDUR]    = dz->duration * 2.0;
        ap->hi[TRAN_MAXDUR]    = 32767;
        ap->default_val[TRAN_MAXDUR] = 0.0;
    }
    dz->maxmode = 5;
    if(!sloom)
        put_default_vals_in_all_params(dz);
    return(FINISHED);
}

/********************************* PARSE_SLOOM_DATA *********************************/

int parse_sloom_data(int argc,char *argv[],char ***cmdline,int *cmdlinecnt,dataptr dz)
{
    int exit_status;
    int cnt = 1, infilecnt;
    int filesize, insams, inbrksize;
    double dummy;
    int true_cnt = 0;
    //aplptr ap;

    while(cnt<=PRE_CMDLINE_DATACNT) {
        if(cnt > argc) {
            sprintf(errstr,"Insufficient data sent from TK\n");
            return(DATA_ERROR);
        }
        switch(cnt) {
        case(1):
            if(sscanf(argv[cnt],"%d",&dz->process)!=1) {
                sprintf(errstr,"Cannot read process no. sent from TK\n");
                return(DATA_ERROR);
            }
            break;

        case(2):
            if(sscanf(argv[cnt],"%d",&dz->mode)!=1) {
                sprintf(errstr,"Cannot read mode no. sent from TK\n");
                return(DATA_ERROR);
            }
            if(dz->mode > 0)
                dz->mode--;
            //setup_particular_application() =
            if((exit_status = setup_transit_application(dz))<0)
                return(exit_status);
            //ap = dz->application;
            break;

        case(3):
            if(sscanf(argv[cnt],"%d",&infilecnt)!=1) {
                sprintf(errstr,"Cannot read infilecnt sent from TK\n");
                return(DATA_ERROR);
            }
            if(infilecnt < 1) {
                true_cnt = cnt + 1;
                cnt = PRE_CMDLINE_DATACNT;    /* force exit from loop after assign_file_data_storage */
            }
            if((exit_status = assign_file_data_storage(infilecnt,dz))<0)
                return(exit_status);
            break;
        case(INPUT_FILETYPE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->filetype)!=1) {
                sprintf(errstr,"Cannot read filetype sent from TK (%s)\n",argv[cnt]);
                return(DATA_ERROR);
            }
            break;
        case(INPUT_FILESIZE+4):
            if(sscanf(argv[cnt],"%d",&filesize)!=1) {
                sprintf(errstr,"Cannot read infilesize sent from TK\n");
                return(DATA_ERROR);
            }
            dz->insams[0] = filesize;
            break;
        case(INPUT_INSAMS+4):
            if(sscanf(argv[cnt],"%d",&insams)!=1) {
                sprintf(errstr,"Cannot read insams sent from TK\n");
                return(DATA_ERROR);
            }
            dz->insams[0] = insams;
            break;
        case(INPUT_SRATE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->srate)!=1) {
                sprintf(errstr,"Cannot read srate sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_CHANNELS+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->channels)!=1) {
                sprintf(errstr,"Cannot read channels sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_STYPE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->stype)!=1) {
                sprintf(errstr,"Cannot read stype sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ORIGSTYPE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->origstype)!=1) {
                sprintf(errstr,"Cannot read origstype sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ORIGRATE+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->origrate)!=1) {
                sprintf(errstr,"Cannot read origrate sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MLEN+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->Mlen)!=1) {
                sprintf(errstr,"Cannot read Mlen sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DFAC+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->Dfac)!=1) {
                sprintf(errstr,"Cannot read Dfac sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ORIGCHANS+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->origchans)!=1) {
                sprintf(errstr,"Cannot read origchans sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_SPECENVCNT+4):
            if(sscanf(argv[cnt],"%d",&dz->infile->specenvcnt)!=1) {
                sprintf(errstr,"Cannot read specenvcnt sent from TK\n");
                return(DATA_ERROR);
            }
            dz->specenvcnt = dz->infile->specenvcnt;
            break;
        case(INPUT_WANTED+4):
            if(sscanf(argv[cnt],"%d",&dz->wanted)!=1) {
                sprintf(errstr,"Cannot read wanted sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_WLENGTH+4):
            if(sscanf(argv[cnt],"%d",&dz->wlength)!=1) {
                sprintf(errstr,"Cannot read wlength sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_OUT_CHANS+4):
            if(sscanf(argv[cnt],"%d",&dz->out_chans)!=1) {
                sprintf(errstr,"Cannot read out_chans sent from TK\n");
                return(DATA_ERROR);
            }
            break;
            /* RWD these chanegs to samps - tk will have to deal with that! */
        case(INPUT_DESCRIPTOR_BYTES+4):
            if(sscanf(argv[cnt],"%d",&dz->descriptor_samps)!=1) {
                sprintf(errstr,"Cannot read descriptor_samps sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_IS_TRANSPOS+4):
            if(sscanf(argv[cnt],"%d",&dz->is_transpos)!=1) {
                sprintf(errstr,"Cannot read is_transpos sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_COULD_BE_TRANSPOS+4):
            if(sscanf(argv[cnt],"%d",&dz->could_be_transpos)!=1) {
                sprintf(errstr,"Cannot read could_be_transpos sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_COULD_BE_PITCH+4):
            if(sscanf(argv[cnt],"%d",&dz->could_be_pitch)!=1) {
                sprintf(errstr,"Cannot read could_be_pitch sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DIFFERENT_SRATES+4):
            if(sscanf(argv[cnt],"%d",&dz->different_srates)!=1) {
                sprintf(errstr,"Cannot read different_srates sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DUPLICATE_SNDS+4):
            if(sscanf(argv[cnt],"%d",&dz->duplicate_snds)!=1) {
                sprintf(errstr,"Cannot read duplicate_snds sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_BRKSIZE+4):
            if(sscanf(argv[cnt],"%d",&inbrksize)!=1) {
                sprintf(errstr,"Cannot read brksize sent from TK\n");
                return(DATA_ERROR);
            }
            if(inbrksize > 0) {
                switch(dz->input_data_type) {
                case(WORDLIST_ONLY):
                    break;
                case(PITCH_AND_PITCH):
                case(PITCH_AND_TRANSPOS):
                case(TRANSPOS_AND_TRANSPOS):
                    dz->tempsize = inbrksize;
                    break;
                case(BRKFILES_ONLY):
                case(UNRANGED_BRKFILE_ONLY):
                case(DB_BRKFILES_ONLY):
                case(ALL_FILES):
                case(ANY_NUMBER_OF_ANY_FILES):
                    if(dz->extrabrkno < 0) {
                        sprintf(errstr,"Storage location number for brktable not established by CDP.\n");
                        return(DATA_ERROR);
                    }
                    if(dz->brksize == NULL) {
                        sprintf(errstr,"CDP has not established storage space for input brktable.\n");
                        return(PROGRAM_ERROR);
                    }
                    dz->brksize[dz->extrabrkno]    = inbrksize;
                    break;
                default:
                    sprintf(errstr,"TK sent brktablesize > 0 for input_data_type [%d] not using brktables.\n",
                            dz->input_data_type);
                    return(PROGRAM_ERROR);
                }
                break;
            }
            break;
        case(INPUT_NUMSIZE+4):
            if(sscanf(argv[cnt],"%d",&dz->numsize)!=1) {
                sprintf(errstr,"Cannot read numsize sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_LINECNT+4):
            if(sscanf(argv[cnt],"%d",&dz->linecnt)!=1) {
                sprintf(errstr,"Cannot read linecnt sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ALL_WORDS+4):
            if(sscanf(argv[cnt],"%d",&dz->all_words)!=1) {
                sprintf(errstr,"Cannot read all_words sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_ARATE+4):
            if(sscanf(argv[cnt],"%f",&dz->infile->arate)!=1) {
                sprintf(errstr,"Cannot read arate sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_FRAMETIME+4):
            if(sscanf(argv[cnt],"%lf",&dummy)!=1) {
                sprintf(errstr,"Cannot read frametime sent from TK\n");
                return(DATA_ERROR);
            }
            dz->frametime = (float)dummy;
            break;
        case(INPUT_WINDOW_SIZE+4):
            if(sscanf(argv[cnt],"%f",&dz->infile->window_size)!=1) {
                sprintf(errstr,"Cannot read window_size sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_NYQUIST+4):
            if(sscanf(argv[cnt],"%lf",&dz->nyquist)!=1) {
                sprintf(errstr,"Cannot read nyquist sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_DURATION+4):
            if(sscanf(argv[cnt],"%lf",&dz->duration)!=1) {
                sprintf(errstr,"Cannot read duration sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MINBRK+4):
            if(sscanf(argv[cnt],"%lf",&dz->minbrk)!=1) {
                sprintf(errstr,"Cannot read minbrk sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MAXBRK+4):
            if(sscanf(argv[cnt],"%lf",&dz->maxbrk)!=1) {
                sprintf(errstr,"Cannot read maxbrk sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MINNUM+4):
            if(sscanf(argv[cnt],"%lf",&dz->minnum)!=1) {
                sprintf(errstr,"Cannot read minnum sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        case(INPUT_MAXNUM+4):
            if(sscanf(argv[cnt],"%lf",&dz->maxnum)!=1) {
                sprintf(errstr,"Cannot read maxnum sent from TK\n");
                return(DATA_ERROR);
            }
            break;
        default:
            sprintf(errstr,"case switch item missing: parse_sloom_data()\n");
            return(PROGRAM_ERROR);
        }
        cnt++;
    }
    if(cnt!=PRE_CMDLINE_DATACNT+1) {
        sprintf(errstr,"Insufficient pre-cmdline params sent from TK\n");
        return(DATA_ERROR);
    }

    if(true_cnt)
        cnt = true_cnt;
    *cmdlinecnt = 0;

    while(cnt < argc) {
        if((exit_status = get_tk_cmdline_word(cmdlinecnt,cmdline,argv[cnt]))<0)
            return(exit_status);
        cnt++;
    }
    return(FINISHED);
}

/********************************* GET_TK_CMDLINE_WORD *********************************/

int get_tk_cmdline_word(int *cmdlinecnt,char ***cmdline,char *q)
{
    if(*cmdlinecnt==0) {
        if((*cmdline = (char **)malloc(sizeof(char *)))==NULL)    {
            sprintf(errstr,"INSUFFICIENT MEMORY for TK cmdline array.\n");
            return(MEMORY_ERROR);
        }
    } else {
        if((*cmdline = (char **)realloc(*cmdline,((*cmdlinecnt)+1) * sizeof(char *)))==NULL)    {
            sprintf(errstr,"INSUFFICIENT MEMORY for TK cmdline array.\n");
            return(MEMORY_ERROR);
        }
    }
    if(((*cmdline)[*cmdlinecnt] = (char *)malloc((strlen(q) + 1) * sizeof(char)))==NULL)    {
        sprintf(errstr,"INSUFFICIENT MEMORY for TK cmdline item %d.\n",(*cmdlinecnt)+1);
        return(MEMORY_ERROR);
    }
    strcpy((*cmdline)[*cmdlinecnt],q);
    (*cmdlinecnt)++;
    return(FINISHED);
}


/****************************** ASSIGN_FILE_DATA_STORAGE *********************************/

int assign_file_data_storage(int infilecnt,dataptr dz)
{
    int exit_status;
    int no_sndfile_system_files = FALSE;
    dz->infilecnt = infilecnt;
    if((exit_status = allocate_filespace(dz))<0)
        return(exit_status);
    if(no_sndfile_system_files)
        dz->infilecnt = 0;
    return(FINISHED);
}



/************************* redundant functions: to ensure libs compile OK *******************/

int assign_process_logic(dataptr dz)
{
    return(FINISHED);
}

void set_legal_infile_structure(dataptr dz)
{}

int set_legal_internalparam_structure(int process,int mode,aplptr ap)
{
    return(FINISHED);
}

int setup_internal_arrays_and_array_pointers(dataptr dz)
{
    return(FINISHED);
}

int establish_bufptrs_and_extra_buffers(dataptr dz)
{
    return(FINISHED);
}

int read_special_data(char *str,dataptr dz)
{
    return(FINISHED);
}

int inner_loop
(int *peakscore,int *descnt,int *in_start_portion,int *least,int *pitchcnt,int windows_in_buf,dataptr dz)
{
    return(FINISHED);
}

int get_process_no(char *prog_identifier_from_cmdline,dataptr dz)
{
    return(FINISHED);
}


/******************************** USAGE1 ********************************/

int usage1(void)
{
    fprintf(stderr,
            "\nCREATE MOTION CROSSING AN 8-CHANNEL RING\n\n"
            "USAGE: transit NAME mode infile(s) outfile parameters: \n"
            "\n"
            "where NAME can be any one of\n"
            "\n"
            "simple    filtered    doppler    doplfilt    sequence    list\n\n"
            "Type 'transit simple' for more info on transit simple..ETC.\n");
    return(USAGE_ONLY);
}


/************************************* CHECK_TRANSIT_PARAM_VALIDITY_AND_CONSISTENCY *********************************/

int check_transit_param_validity_and_consistency(dataptr dz)
{
    char temp[200], *p;
    int got0 = 0, got9 = 0, got5 = 0, OK = 0;
    if(EVEN(dz->mode)) {
        sprintf(temp,"%lf",dz->param[TRAN_FOCUS]);
        p = temp + strlen(temp);
        p--;
        got5 = 0;
        while(p != temp) {
            if(*p == '0') {
                if(got9)
                    break;
                got0 = 1;
                p--;
            } else if(*p == '9') {
                if(got0)
                    break;
                got9 = 1;
                p--;
            } else if(*p == '.') {
                if(!(got0 || got9))
                    break;
                OK = 1;
                break;
            } else
                break;
        }
        if(!OK) {
            sprintf(errstr,"FOCUS must have integer values in this mode.\n");
            return(DATA_ERROR);
        }
        dz->iparam[TRAN_FOCUS] = (int)round(dz->param[TRAN_FOCUS]);
        if(dz->iparam[TRAN_FOCUS] < 1 || dz->iparam[TRAN_FOCUS] > 8) {
            sprintf(errstr,"Invalid Motion Centre.\n");
            return(DATA_ERROR);
        }
        dz->param[TRAN_FOCUS] = (double)dz->iparam[TRAN_FOCUS];
    } else {
        sprintf(temp,"%lf",dz->param[TRAN_FOCUS]);
        p = temp + strlen(temp);
        p--;
        got5 = 0;
        while(p != temp) {
            if(*p == '0') {
                if(got5 || got9)
                    break;
                got0 = 1;
                p--;
            } else if(*p == '9') {
                if(got5 || got0)
                    break;
                got9 = 1;
                p--;
            } else if(*p == '5') {
                if(got9)
                    break;
                got5 = 1;
                p--;
            } else if(*p == '4') {
                if(got0)
                    break;
                got5 = 1;
                p--;
            } else if(*p == '.') {
                if(!got5)
                    break;
                OK = 1;
                break;
            } else
                break;
        }
        if(!OK) {
            sprintf(errstr,"FOCUS must have half integer values (1.5 : 4.5 : etc) in this mode.\n");
            return(DATA_ERROR);
        }
        dz->iparam[TRAN_FOCUS] = (int)round(dz->param[TRAN_FOCUS] * 2);
        dz->param[TRAN_FOCUS]  = (double)dz->iparam[TRAN_FOCUS]/2.0;
        if(dz->param[TRAN_FOCUS] <= 0.0)
            dz->param[TRAN_FOCUS] += 8.0;
        else if(dz->param[TRAN_FOCUS] > 8.0)
            dz->param[TRAN_FOCUS] -= 8.0;
    }
    if(dz->process < TRANSITS) {
        if(dz->param[TRAN_THRESH] > 0.0) {
            if(dz->param[TRAN_DECLIM] <= 0.0 || dz->param[TRAN_MINLEV] <= 0.0 || dz->param[TRAN_MAXDUR] <= 0.0) {
                sprintf(errstr,"Threshold set: decimation-limit,minlevel & maxdur must have non-zero vals.\n");
                return(DATA_ERROR);
            }
            if(dz->param[TRAN_DECLIM] <= dz->param[TRAN_DEC]) {
                sprintf(errstr,"Decimation Maximum must be greater than Decimation.\n");
                return(DATA_ERROR);
            }
            if(dz->param[TRAN_MINLEV] >= dz->param[TRAN_THRESH]) {
                sprintf(errstr,"Minimum Extension Gain must be less than Extension Threshold.\n");
                return(DATA_ERROR);
            }
            if(dz->param[TRAN_MAXDUR] <= dz->param[TRAN_DUR]) {
                sprintf(errstr,"Maximum Duration either not set, or less than Duration (%lf).\n",dz->param[TRAN_DUR]);
                return(DATA_ERROR);
            }
        } else if(dz->param[TRAN_DECLIM] > 0.0 || dz->param[TRAN_MINLEV] > 0.0 || dz->param[TRAN_MAXDUR] > 0.0) {
            fprintf(stdout,"WARNING: Threshold NOT set: decimation-limit, minlevel and maxdur values ignored.\n");
            fflush(stdout);
        }
    }
    if(flteq(dz->param[TRAN_DEC],0.0)) {
        fprintf(stdout,"WARNING: Decimation zero will delte all events except the central event(s).\n");
        fflush(stdout);
    }
    return FINISHED;
}

/************************************* TRANSIT_PARAM_PREPROCESS *********************************/

int transit_param_preprocess(dataptr dz)
{
    int exit_status;
    int arraysize, n, m, stepcnt;
    double linear_steplen = 0, timestep, dur, dec, lev, newdec, now, distance_to_centre, first_quadrant = 0, second_quadrant = 0, thispos;
    double *level, *pos, *time, *balance;
    int *spkr, *snd;
    int in_extension, at_decr_incr_end, cnt, on_2nd_pair, on_3rd_pair, spkr1 = 0, spkr2 = 0;
    if(dz->mode != CENTRAL)
        dz->param[TRAN_MAXA] *= PI/180.0;
    if(dz->process >= TRANSITS)
        stepcnt = (dz->infilecnt/2) + 1;
    else
        stepcnt = dz->iparam[TRAN_STEPS];
    switch(dz->mode) {
    case(GLANCING):                                                    //    Assuming halfradius (distance lspkr to centre) = 1
        linear_steplen = tan(dz->param[TRAN_MAXA]);                    //  tan of maxangle = Total-pathlength/halfradius
        linear_steplen /= (double)stepcnt;                            //    Divide total len by number of steps to get steplen
        break;                                                        //    (as fraction of halfradius = 1).
    case(EDGEWISE):                                                    //    If distance from path to centre is less than half-radius
        linear_steplen = tan(dz->param[TRAN_MAXA]) * cos(DEG22);    //    tan of maxangle = Total-pathlength/distance_to_centre
        linear_steplen /= (double)stepcnt;                            //    (here distance_to_centre = cos22)
        break;                                                        //    Divide total len by number of steps to get real len
    case(CROSSING):                                                    //    ETC
        linear_steplen = tan(dz->param[TRAN_MAXA]) * cos(DEG45);
        linear_steplen /= (double)stepcnt;
        break;
    case(CLOSE):
        linear_steplen = tan(dz->param[TRAN_MAXA]) * cos(DEG67);
        linear_steplen /= (double)stepcnt;
        break;
    case(CENTRAL):                                                    //    Here steplen is simply total-length divided by event-count
        linear_steplen = dz->param[TRAN_MAXA]/(double)stepcnt;
        break;
    }

    timestep = dz->param[TRAN_DUR]/(double)stepcnt;
    if((dz->process < TRANSITS) && dz->param[TRAN_THRESH] > 0.0) {    //    If path extension being used
        in_extension = 0;                                            //    Check how many more steps this involves
        at_decr_incr_end = 0;                                        //    Before mallocing storage arrays
        dur = timestep;
        cnt = 1;
        lev = 1.0;
        dec = dz->param[TRAN_DEC];
        while(dur <dz->param[TRAN_MAXDUR]) {                        //    Quit if maximum duration reached
            lev = lev * dec;
            if(in_extension && (lev < dz->param[TRAN_MINLEV]))        //    Quit if minimum level reached
                break;
            if(in_extension || (lev < dz->param[TRAN_THRESH])) {    //    Once level falls below threshold
                if(!at_decr_incr_end) {                                //    Start incrementing decrement
                    newdec = dec + (1.0 - dec)/2.0;
                    if(newdec >= dz->param[TRAN_DECLIM])            //    If decrement reaches the prescribed maximum
                        at_decr_incr_end = 1;                        //    Stop incrementing decrement
                    else
                        dec = newdec;
                }
                in_extension = 1;
            }
            dur += timestep;
            cnt++;
        }
    } else
        cnt = stepcnt;
    arraysize = cnt * 2;                                            //    Events approach then recede, doubling number of events
    arraysize += 4;    //    SAFETY
    dz->ringsize = arraysize;
    dz->array_cnt = 4;
    if((dz->parray = (double **)malloc(dz->array_cnt * sizeof(double *)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to create data float arrays.\n");
        return(MEMORY_ERROR);
    }
    dz->iarray_cnt = 2;
    if((dz->iparray = (int **)malloc(dz->iarray_cnt * sizeof(int *)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to create data integer arrays.\n");
        return(MEMORY_ERROR);
    }
    if((dz->parray[TR_LEVEL] = (double *)malloc(arraysize * sizeof(double)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to store segment levels.\n");
        return(MEMORY_ERROR);
    }
    level = dz->parray[TR_LEVEL];
    if((dz->parray[TR_POSITION] = (double *)malloc(arraysize * sizeof(double)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to store segment positions.\n");
        return(MEMORY_ERROR);
    }
    pos = dz->parray[TR_POSITION];
    if((dz->parray[TR_TIME] = (double *)malloc(arraysize * sizeof(double)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to store segment positions.\n");
        return(MEMORY_ERROR);
    }
    time = dz->parray[TR_TIME];
    if((dz->parray[TR_FLTMIX] = (double *)malloc(arraysize * sizeof(double)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to store segment balance.\n");
        return(MEMORY_ERROR);
    }
    balance = dz->parray[TR_FLTMIX];
    if((dz->iparray[TR_SPKRPAIR] = (int *)malloc(arraysize * 2 * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to store lspkr pairs.\n");
        return(MEMORY_ERROR);
    }
    spkr = dz->iparray[TR_SPKRPAIR];
    if((dz->iparray[TR_SNDFILE] = (int *)malloc(arraysize * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY to store soundfiles used.\n");
        return(MEMORY_ERROR);
    }
    snd = dz->iparray[TR_SNDFILE];
    dec = dz->param[TRAN_DEC];
    in_extension = 0;
    at_decr_incr_end = 0;
    now = 0.0;                                //    d = linear_steplen.
    lev = 1.0;                                //    Distance to centre = x
    on_2nd_pair = 0;                        //  tan of angle at centre = (d * n)/x
    on_3rd_pair = 0;                        //
    time[0] = 0.0;                            //        O-d-|-d-|-d-        -d-|-d-|-d-
    level[0] = 1.0;                            //   O    |  O             O | O
    switch(dz->mode) {                        //      |x                   |x
    case(GLANCING):                            //  O    c    O    ~OR~   O   |   O    ~OR~ ETC
        distance_to_centre = 1.0;            //                           c
        first_quadrant  = DEG45;            //     O       O           O       O
        second_quadrant = DEG45;            //        O
        spkr1 = dz->iparam[TRAN_FOCUS];        //                         O   O
        spkr2 = spkr1 + 1;
        if(spkr2 > 8)
            spkr2 -= 8;
        pos[0] = 0.0;
        break;
    case(EDGEWISE):
        distance_to_centre = cos(DEG22);
        first_quadrant  = DEG22;
        second_quadrant = DEG67;
        spkr1 = (int)floor(dz->param[TRAN_FOCUS]);
        spkr2 = spkr1 + 1;
        if(spkr2 > 8)
            spkr2 -= 8;
        pos[0] = 0.5;
        break;
    case(CROSSING):
        distance_to_centre = cos(DEG45);
        first_quadrant  = DEG45;
        second_quadrant = DEG45;    //    REDUNDANT
        spkr1 = dz->iparam[TRAN_FOCUS] - 1;
        if(spkr1 <= 0)
            spkr1 += 8;
        spkr2 = spkr1 + 2;
        if(spkr2 > 8)
            spkr2 -= 8;
        pos[0] = 0.5;
        break;
    case(CLOSE):
        distance_to_centre = cos(DEG67);
        first_quadrant  = DEG67;
        second_quadrant = DEG45;    //    REDUNDANT
        spkr1 = (int)floor(dz->param[TRAN_FOCUS]) - 1;
        if(spkr1 <= 0)
            spkr1 += 8;
        spkr2 = spkr1 + 3;
        if(spkr2 > 8)
            spkr2 -= 8;
        pos[0] = 0.5;
        break;
    case(CENTRAL):
        distance_to_centre = 0;
        first_quadrant     = 0;        //    REDUNDANT
        second_quadrant    = 0;        //    REDUNDANT
        spkr1 = dz->iparam[TRAN_FOCUS] - 2;
        if(spkr1 <= 0)
            spkr1 += 8;
        spkr2 = spkr1 + 4;
        if(spkr2 > 8)
            spkr2 -= 8;
        pos[0] = 0.5;
        break;
    }
    spkr[0] = spkr1;
    spkr[1] = spkr2;

    for(n=1,m=2;n<stepcnt;n++,m+=2) {
        if((exit_status = get_position(&thispos,&spkr1,&spkr2,linear_steplen,n,&distance_to_centre,first_quadrant,second_quadrant,&on_2nd_pair,&on_3rd_pair,dz))<0)
            return(exit_status);
        pos[n] = thispos;
        spkr[m]   = spkr1;
        spkr[m+1] = spkr2;
        now += timestep;
        lev *= dec;
        level[n] = lev;
        time[n] = now;
        if((dz->process < TRANSITS) && dz->param[TRAN_THRESH] > 0.0) {    //    Data extended
            if(in_extension || (lev < dz->param[TRAN_THRESH])) {
                if(!at_decr_incr_end) {
                    newdec = dec + (1.0 - dec)/2.0;
                    if(newdec >= dz->param[TRAN_DECLIM])
                        at_decr_incr_end = 1;
                    else
                        dec = newdec;
                }
                in_extension = 1;
            }
            if(in_extension && (lev < dz->param[TRAN_MINLEV]))
                break;
        }
    }
    if((dz->process < TRANSITS) && dz->param[TRAN_THRESH] > 0.0) {    //    Data extended
        while(now <dz->param[TRAN_MAXDUR]) {
            lev *= dec;
            if(in_extension && (lev < dz->param[TRAN_MINLEV]))
                break;
            if((exit_status = get_position(&thispos,&spkr1,&spkr2,linear_steplen,n,&distance_to_centre,first_quadrant,second_quadrant,&on_2nd_pair,&on_3rd_pair,dz))<0)
                return(exit_status);
            pos[n] = thispos;
            spkr[m]   = spkr1;
            spkr[m+1] = spkr2;
            now += timestep;
            level[n] = lev;
            time[n] = now;
            n++;
            m += 2;
        }
    }
    dz->itemcnt = n;
    if((exit_status = ReorientData(pos,time,level,spkr,dz)) < 0)    //    Mirror receding motion into approaching motion
        return exit_status;
    if(dz->process == TRANSITF || dz->process == TRANSITFD) {        //    Insert filter balance data
        if((exit_status = calc_filters(balance,spkr,dz)) < 0)
            return exit_status;
    }
    if((exit_status = insert_sounds(snd,dz)) < 0)                    //    Assign files for doppler-shift
        return exit_status;
    if(dz->vflag[0])                                                //     Move towards left, if flagged
        leftwards(pos,time,level,spkr,dz);
    return (FINISHED);
}

/************************************ PANCALC *******************************/

void pancalc(double position,double *leftgain,double *rightgain)
{
    int dirflag;
    double temp;
    double relpos;
    double reldist, invsquare;

    if(position < 0.0)
        dirflag = SIGNAL_TO_LEFT;        /* signal on left */
    else
        dirflag = SIGNAL_TO_RIGHT;

    if(position < 0)
        relpos = -position;
    else
        relpos = position;
    if(relpos <= 1.0){        /* between the speakers */
        temp = 1.0 + (relpos * relpos);
        reldist = ROOT2 / sqrt(temp);
        temp = (position + 1.0) / 2.0;
        *rightgain = temp * reldist;
        *leftgain = (1.0 - temp ) * reldist;
    } else {                /* outside the speakers */
        temp = (relpos * relpos) + 1.0;
        reldist  = sqrt(temp) / ROOT2;   /* relative distance to source */
        invsquare = 1.0 / (reldist * reldist);
        if(dirflag == SIGNAL_TO_LEFT){
            *leftgain = invsquare;
            *rightgain = 0.0;
        } else {   /* SIGNAL_TO_RIGHT */
            *rightgain = invsquare;
            *leftgain = 0;
        }
    }
}

/********************************************************************************************/

int get_the_process_no(char *prog_identifier_from_cmdline,dataptr dz)
{
    if(!strcmp(prog_identifier_from_cmdline,"simple"))            dz->process = TRANSIT;
    else if(!strcmp(prog_identifier_from_cmdline,"filtered"))    dz->process = TRANSITF;
    else if(!strcmp(prog_identifier_from_cmdline,"doppler"))    dz->process = TRANSITD;
    else if(!strcmp(prog_identifier_from_cmdline,"doplfilt"))    dz->process = TRANSITFD;
    else if(!strcmp(prog_identifier_from_cmdline,"sequence"))    dz->process = TRANSITS;
    else if(!strcmp(prog_identifier_from_cmdline,"list"))        dz->process = TRANSITL;
    else {
        sprintf(errstr,"Unknown program identification string '%s'\n",prog_identifier_from_cmdline);
        return(USAGE_ONLY);
    }
    return(FINISHED);
}

/******************************** SETUP_AND_INIT_INPUT_BRKTABLE_CONSTANTS ********************************/

int setup_and_init_input_brktable_constants(dataptr dz,int brkcnt)
{
    int n;
    if((dz->brk      = (double **)malloc(brkcnt * sizeof(double *)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 1\n");
        return(MEMORY_ERROR);
    }
    if((dz->brkptr   = (double **)malloc(brkcnt * sizeof(double *)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 6\n");
        return(MEMORY_ERROR);
    }
    if((dz->brksize  = (int    *)malloc(brkcnt * sizeof(int)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 2\n");
        return(MEMORY_ERROR);
    }
    if((dz->firstval = (double  *)malloc(brkcnt * sizeof(double)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 3\n");
        return(MEMORY_ERROR);
    }
    if((dz->lastind  = (double  *)malloc(brkcnt * sizeof(double)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 4\n");
        return(MEMORY_ERROR);
    }
    if((dz->lastval  = (double  *)malloc(brkcnt * sizeof(double)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 5\n");
        return(MEMORY_ERROR);
    }
    if((dz->brkinit  = (int     *)malloc(brkcnt * sizeof(int)))==NULL) {
        sprintf(errstr,"setup_and_init_input_brktable_constants(): 7\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<brkcnt;n++) {
        dz->brk[n]     = NULL;
        dz->brkptr[n]  = NULL;
        dz->brkinit[n] = 0;
        dz->brksize[n] = 0;
    }
    return(FINISHED);
}

/******************************** USAGE2 ********************************/

int usage2(char *str)
{
    if(!strcmp(str,"simple")) {
        fprintf(stdout,
                "USAGE: transit simple 1-5 infile outfile\n"
                "       focus dur steps max dec [-tthres -dlim -etlim -mmaxdur] [-l]\n"
                "\n"
                "Place repetitions of a mono sound on tangent path to & from 8-channel array.\n"
                "Lspkrs equidistant in a ring, numbered clockwise, Output is a mixfile.\n"
                "\n"
                "MODES:\n"
                "      1                2                3               4               5\n"
                "   (glancing)      (edgewise)      (crossing)         (close)        (central)\n"
                "->>---O->>      ->>--O---O->>           O             O   O             O\n"
                "  O       O                    ->>--O-------O->>                    O       O\n"
                "                  O         O                  ->>-O---------O->>\n"
                " O         O                       O         O                 ->>-O---------O->>\n"
                "                  O         O                      O         O\n"
                "  O       O                         O       O                       O       O\n"
                "      O              O   O              O             O   O             O\n"
                "\n"
                "FOCUS  Centre of motion. Integer for odd modes, 1.5 ; 2.5 etc for even modes.\n"
                "DUR    Duration of motion from edge to centre (ONLY).\n"
                "STEPS  Count of events from edge to centre (ONLY).\n"
                "MAXA   (Modes 1-4) Maxangle from centreline reached( < 90).\n"
                "MAXD   (Mode 5) Max distance from centre reached, where halfradius = 1.\n"
                "DEC    Gain decrement (>0 <1) on passing from one event to the next.\n"
                "\n"
                "To extend motion further (increasing duration and total number of events)....\n"
                "gain decrement can be modofied with these 4 parameters ... \n"
                "\n"
                "THRESH Threshold (overall) gain at which gain decrement starts to increase.\n"
                "LIM    Maximum level of gain decrement after this point (> DEC).\n"
                "TLIM   Minimum (overall) gain at which event ends ( < THRESH).\n"
                "MAXDUR Max duration motion edge-to-centre (in case TLIM never reached) ( >= DUR).\n"
                "\n"
                "-l     Motion towards left of focal position (Default: motion towards right).\n");
    } else if(!strcmp(str,"filtered")) {
        fprintf(stdout,
                "USAGE: transit filtered 1-5 infile1 infile2 outfile\n"
                "       focus dur steps max dec fdec [-tthres -dlim -etlim -mmaxdur] [-l]\n"
                "\n"
                "Place repetitions of a mono sound on tangent path to & from 8-channel array.\n"
                "Lspkrs equidistant in a ring, numbered clockwise, Output is a mixfile.\n"
                "\n"
                "Second sound is filtered version of first, suggesting greater distance.\n"
                "Gradually mix in more of 2nd input sound, with greater distance from centre.\n"
                "\n"
                "MODES:\n"
                "      1                2                3               4               5\n"
                "   (glancing)      (edgewise)      (crossing)         (close)        (central)\n"
                "->>---O->>      ->>--O---O->>           O             O   O             O\n"
                "  O       O                    ->>--O-------O->>                    O       O\n"
                "                  O         O                  ->>-O---------O->>\n"
                " O         O                       O         O                 ->>-O---------O->>\n"
                "                  O         O                      O         O\n"
                "  O       O                         O       O                       O       O\n"
                "      O              O   O              O             O   O             O\n"
                "\n"
                "FOCUS  Centre of motion. Integer for odd modes, 1.5 ; 2.5 etc for even modes.\n"
                "DUR    Duration of motion from edge to centre (ONLY).\n"
                "STEPS  Count of events from edge to centre (ONLY).\n"
                "MAXA   (Modes 1-4) Maxangle from centreline reached( < 90).\n"
                "MAXD   (Mode 5) Max distance from centre reached, where halfradius = 1.\n"
                "DEC    Gain decrement (>0 <1) on passing from one event to the next.\n"
                "FDEC   Progressive mix-in of infile2 (range 0-1).\n"
                "\n"
                "To extend motion further (increasing duration and total number of events)....\n"
                "gain decrement can be modofied with these 4 parameters ... \n"
                "\n"
                "THRESH Threshold (overall) gain at which gain decrement starts to increase.\n"
                "LIM    Maximum level of gain decrement after this point (> DEC).\n"
                "TLIM   Minimum (overall) gain at which event ends ( < THRESH).\n"
                "MAXDUR Max duration motion edge-to-centre (in case TLIM never reached) ( >= DUR).\n"
                "\n"
                "-l     Motion towards left of focal position (Default: motion towards right).\n");
    } else if(!strcmp(str,"doppler")) {
        fprintf(stdout,
                "USAGE: transit doppler 1-5 infile1 infile2 [infile3 ....] outfile\n"
                "       focus dur steps max dec [-tthres -dlim -etlim -mmaxdur] [-l]\n"
                "\n"
                "Place repetitions of a mono sound on tangent path to & from 8-channel array.\n"
                "Lspkrs equidistant in a ring, numbered clockwise, Output is a mixfile.\n"
                "\n"
                "Second sound is pitch-shifted version of first, suggesting doppler shift.\n"
                "Change to sound 2 after centre is passed.\n"
                "(Possibly insert more sounds around motioncentre: suggest gradual doppler change\n"
                " NB order of sounds is aprroaching-sound, final-sound, intermediate-sounds.)\n"
                "\n"
                "MODES:\n"
                "      1                2                3               4               5\n"
                "   (glancing)      (edgewise)      (crossing)         (close)        (central)\n"
                "->>---O->>      ->>--O---O->>           O             O   O             O\n"
                "  O       O                    ->>--O-------O->>                    O       O\n"
                "                  O         O                  ->>-O---------O->>\n"
                " O         O                       O         O                 ->>-O---------O->>\n"
                "                  O         O                      O         O\n"
                "  O       O                         O       O                       O       O\n"
                "      O              O   O              O             O   O             O\n"
                "\n"
                "FOCUS  Centre of motion. Integer for odd modes, 1.5 ; 2.5 etc for even modes.\n"
                "DUR    Duration of motion from edge to centre (ONLY).\n"
                "STEPS  Count of events from edge to centre (ONLY).\n"
                "MAXA   (Modes 1-4) Maxangle from centreline reached( < 90).\n"
                "MAXD   (Mode 5) Max distance from centre reached, where halfradius = 1.\n"
                "DEC    Gain decrement (>0 <1) on passing from one event to the next.\n"
                "\n"
                "To extend motion further (increasing duration and total number of events)....\n"
                "gain decrement can be modofied with these 4 parameters ... \n"
                "\n"
                "THRESH Threshold (overall) gain at which gain decrement starts to increase.\n"
                "LIM    Maximum level of gain decrement after this point (> DEC).\n"
                "TLIM   Minimum (overall) gain at which event ends ( < THRESH).\n"
                "MAXDUR Max duration motion edge-to-centre (in case TLIM never reached) ( >= DUR).\n"
                "\n"
                "-l     Motion towards left of focal position (Default: motion towards right).\n");
    } else if(!strcmp(str,"doplfilt")) {
        fprintf(stdout,
                "USAGE: transit doplfilt 1-5 infil1 infil2 infil3 infil4 [infil5...] outfil\n"
                "       focus dur steps max dec fdec [-tthres -dlim -etlim -mmaxdur] [-l]\n"
                "\n"
                "Place repetitions of a mono sound on tangent path to & from 8-channel array.\n"
                "Lspkrs equidistant in a ring, numbered clockwise, Output is a mixfile.\n"
                "\n"
                "Second sound is filtered version of infile1, suggesting greater distance.\n"
                "Gradually mix in more of 2nd input sound, with greater distance from centre.\n"
                "Third sound is pitch-shifted version of first, suggesting doppler shift.\n"
                "Switch to sound3 after centre is passed.\n"
                "Fourth sound is filtered version of third, suggesting greater distance.\n"
                "(Possibly insert more sounds around motioncentre: suggest gradual doppler change\n"
                " NB order of sounds is\n"
                " aprroaching-snd, same_snd filtered, final-sound, final-sound filtered,\n"
                " followed by any intermediate sounds at the doppler-shift centre.)\n"
                "\n"
                "MODES:1                2                3               4               5\n"
                "   (glancing)      (edgewise)      (crossing)         (close)        (central)\n"
                "->>---O->>      ->>--O---O->>           O             O   O             O\n"
                "  O       O                    ->>--O-------O->>                    O       O\n"
                "                  O         O                  ->>-O---------O->>\n"
                " O         O                       O         O                 ->>-O---------O->>\n"
                "                  O         O                      O         O\n"
                "  O       O                         O       O                       O       O\n"
                "      O              O   O              O             O   O             O\n"
                "\n"
                "FOCUS  Centre of motion. Integer for odd modes, 1.5 ; 2.5 etc for even modes.\n"
                "DUR    Duration of motion from edge to centre (ONLY).\n"
                "STEPS  Count of events from edge to centre (ONLY).\n"
                "MAXA   (Modes 1-4) Maxangle from centreline reached( < 90).\n"
                "MAXD   (Mode 5) Max distance from centre reached, where halfradius = 1.\n"
                "DEC    Gain decrement (>0 <1) on passing from one event to the next.\n"
                "\n"
                "To extend motion further (increasing duration and total number of events)....\n"
                "gain decrement can be modofied with these 4 parameters ... \n"
                "\n"
                "THRESH Threshold (overall) gain at which gain decrement starts to increase.\n"
                "LIM    Maximum level of gain decrement after this point (> DEC).\n"
                "TLIM   Minimum (overall) gain at which event ends ( < THRESH).\n"
                "MAXDUR Max duration motion edge-to-centre (in case TLIM never reached) ( >= DUR).\n"
                "\n"
                "-l     Motion towards left of focal position (Default: motion towards right).\n");
    } else if(!strcmp(str,"sequence")) {
        fprintf(stdout,
                "USAGE: transit sequence 1-5 infile infile2 infile3 [infile4 ....] outfile focus dur max dec [-l]\n"
                "\n"
                "Position a sequence of (at least 3) mono sounds (an odd number of sounds)\n"
                "on tangent path to & from 8-channel array.\n"
                "Lspkrs equidistant in a ring, numbered clockwise, Output is a mixfile.\n"
                "\n"
                "MODES:\n"
                "      1                2                3               4               5\n"
                "   (glancing)      (edgewise)      (crossing)         (close)        (central)\n"
                "->>---O->>      ->>--O---O->>           O             O   O             O\n"
                "  O       O                    ->>--O-------O->>                    O       O\n"
                "                  O         O                  ->>-O---------O->>\n"
                " O         O                       O         O                 ->>-O---------O->>\n"
                "                  O         O                      O         O\n"
                "  O       O                         O       O                       O       O\n"
                "      O              O   O              O             O   O             O\n"
                "\n"
                "FOCUS  Centre of motion. Integer for odd modes, 1.5 ; 2.5 etc for even modes.\n"
                "DUR    Duration of motion from edge to centre (ONLY).\n"
                "MAXA   (Modes 1-4) Maxangle from centreline reached( < 90).\n"
                "MAXD   (Mode 5) Max distance from centre reached, where halfradius = 1.\n"
                "DEC    Gain decrement (>0 <1) on passing from one event to the next.\n"
                "\n"
                "-l     Motion towards left of focal position (Default: motion towards right).\n");
    } else if(!strcmp(str,"list")) {
        fprintf(stdout,
                "USAGE: transit list 1-5 intextfile outfile focus dur max dec [-l]\n"
                "\n"
                "Position a sequence of (at least 3) mono sounds, listed in a textfile,\n"
                "(there must be an odd number of sounds)\n"
                "on tangent path to & from 8-channel array.\n"
                "Lspkrs equidistant in a ring, numbered clockwise, Output is a mixfile.\n"
                "\n"
                "MODES:\n"
                "      1                2                3               4               5\n"
                "   (glancing)      (edgewise)      (crossing)         (close)        (central)\n"
                "->>---O->>      ->>--O---O->>           O             O   O             O\n"
                "  O       O                    ->>--O-------O->>                    O       O\n"
                "                  O         O                  ->>-O---------O->>\n"
                " O         O                       O         O                 ->>-O---------O->>\n"
                "                  O         O                      O         O\n"
                "  O       O                         O       O                       O       O\n"
                "      O              O   O              O             O   O             O\n"
                "\n"
                "FOCUS  Centre of motion. Integer for odd modes, 1.5 ; 2.5 etc for even modes.\n"
                "DUR    Duration of motion from edge to centre (ONLY).\n"
                "MAXA   (Modes 1-4) Maxangle from centreline reached( < 90).\n"
                "MAXD   (Mode 5) Max distance from centre reached, where halfradius = 1.\n"
                "DEC    Gain decrement (>0 <1) on passing from one event to the next.\n"
                "\n"
                "-l     Motion towards left of focal position (Default: motion towards right).\n");
    } else
        fprintf(stdout,"Unknown option '%s'\n",str);
    return(USAGE_ONLY);
}

int usage3(char *str1,char *str2)
{
    fprintf(stderr,"Insufficient parameters on command line.\n");
    return(USAGE_ONLY);
}

/******************************** TRANSIT ********************************/

int transit(dataptr dz)
{
    int doplbas = 0, lspkr, rspkr, sound, n, m;
    char temp[400], temp2[400];
    double thispos, thistime, lev, leftgain, rightgain, bal, lgain, rgain;
    double *level = dz->parray[TR_LEVEL], *pos = dz->parray[TR_POSITION], *time = dz->parray[TR_TIME], *balance = dz->parray[TR_FLTMIX];
    int *spkr = dz->iparray[TR_SPKRPAIR], *snd = dz->iparray[TR_SNDFILE];

    if(dz->process == TRANSITFD)        //    Note where doplshifting (extra) sounds begin in input files
        doplbas = 4;
    else if(dz->process == TRANSITF)
        doplbas = 2;
    sprintf(temp,"%d\n",8);
    if(fputs(temp,dz->fp) < 0) {
        sprintf(errstr,"Error writing to output data file\n");
        return(PROGRAM_ERROR);
    }
    for(n=0,m=0;n<dz->itemcnt;n++,m+=2) {
        sound   = snd[n];
        thistime= time[n];
        lev        = level[n];
        thispos = pos[n];
        lspkr   = spkr[m];
        rspkr   = spkr[m+1];
        if(dz->mode == CENTRAL && (fabs(thispos) >= 1)) {
            if(thispos >= 1.0) {    //    end of motion
                if(dz->vflag[0]) {    //    leftwards
                    rightgain = 0.0;
                    leftgain  = 1.0;
                } else {
                    leftgain  = 0.0;
                    rightgain = 1.0;
                }
            } else {                //    start of motion
                if(dz->vflag[0]) {    //    leftwards
                    leftgain  = 0.0;
                    rightgain = 1.0;
                } else {
                    rightgain = 0.0;
                    leftgain  = 1.0;
                }
            }
        } else {
            thispos = (thispos * 2.0) - 1.0;        //    Convert to -1 to 1 format
            pancalc(thispos,&leftgain,&rightgain);    //    Lspkr levels corresponding to interlspkr distance
        }
        if(dz->process == TRANSITF || ((dz->process == TRANSITFD) && (sound < doplbas))) {
            bal = balance[n];
            lgain = leftgain  * bal;            //    IF filtered version, times relative level of unfiltered sound
            rgain = rightgain * bal;
        } else {
            lgain = leftgain;
            rgain = rightgain;
        }
        lgain *= lev;                                //    times level-factor for distance
        rgain *= lev;
        if(lgain > TR_MIN_GAIN || rgain > TR_MIN_GAIN) {
            sprintf(temp,"%s",dz->wordstor[sound]);    //    Only if we have a valid output
            strcat(temp," ");                        //    Output mix line corresponding to event
            sprintf(temp2,"%lf",thistime);
            strcat(temp,temp2);
            if(lgain > TR_MIN_GAIN) {
                strcat(temp," 1 1:");
                sprintf(temp2,"%d",lspkr);
                strcat(temp,temp2);
                strcat(temp," ");
                sprintf(temp2,"%lf",lgain);
                strcat(temp,temp2);
            }
            if(rgain > TR_MIN_GAIN ) {
                strcat(temp," 1:");
                sprintf(temp2,"%d",rspkr);
                strcat(temp,temp2);
                strcat(temp," ");
                sprintf(temp2,"%lf",rgain);
                strcat(temp,temp2);
            }
            strcat(temp,"\n");
            if(fputs(temp,dz->fp) < 0) {
                sprintf(errstr,"Error writing to output data file\n");
                return(PROGRAM_ERROR);
            }
        }                                        //    If there's a filtered version of the sound
        if(dz->process == TRANSITF || ((dz->process == TRANSITFD) && (sound < doplbas))) {
            bal = balance[n];
            lgain = leftgain  * (1.0 - bal);
            rgain = rightgain * (1.0 - bal);    //    Get level of filtered version of sound
            lgain *= lev;                        //    times level-factor for distance
            rgain *= lev;
            if(lgain > TR_MIN_GAIN || rgain > TR_MIN_GAIN) {
                sound++;                        //    Get filtered sound
                sprintf(temp,"%s",dz->wordstor[sound]);
                strcat(temp," ");
                sprintf(temp2,"%lf",thistime);
                strcat(temp,temp2);
                if(lgain > TR_MIN_GAIN) {
                    strcat(temp," 1 1:");
                    sprintf(temp2,"%d",lspkr);
                    strcat(temp,temp2);
                    strcat(temp," ");
                    sprintf(temp2,"%lf",lgain);
                    strcat(temp,temp2);
                }
                if(rgain > TR_MIN_GAIN ) {
                    strcat(temp," 1:");
                    sprintf(temp2,"%d",rspkr);
                    strcat(temp,temp2);
                    strcat(temp," ");
                    sprintf(temp2,"%lf",rgain);
                    strcat(temp,temp2);
                }
                strcat(temp,"\n");
                if(fputs(temp,dz->fp) < 0) {
                    sprintf(errstr,"Error writing to output data file\n");
                    return(PROGRAM_ERROR);
                }
            }
        }
    }
    return FINISHED;
}

/****************************** GET_MODE *********************************/

int get_the_mode_from_cmdline(char *str,dataptr dz)
{
    char temp[200], *p;
    if(sscanf(str,"%s",temp)!=1) {
        sprintf(errstr,"Cannot read mode of program.\n");
        return(USAGE_ONLY);
    }
    p = temp + strlen(temp) - 1;
    while(p >= temp) {
        if(!isdigit(*p)) {
            fprintf(stderr,"Invalid mode of program entered.\n");
            return(USAGE_ONLY);
        }
        p--;
    }
    if(sscanf(str,"%d",&dz->mode)!=1) {
        fprintf(stderr,"Cannot read mode of program.\n");
        return(USAGE_ONLY);
    }
    if(dz->mode <= 0 || dz->mode > dz->maxmode) {
        fprintf(stderr,"Program mode value [%d] is out of range [1 - %d].\n",dz->mode,dz->maxmode);
        return(USAGE_ONLY);
    }
    dz->mode--;        /* CHANGE TO INTERNAL REPRESENTATION OF MODE NO */
    return(FINISHED);
}

/****************************** STORE_THE_FILENAME *********************************/

int store_the_filename(char *filename,dataptr dz)
{
    char *p;
    int k;
    if(dz->wordstor != NULL) {
        sprintf(errstr,"Cannot store filename: wordstor already allocated.\n");
        return(PROGRAM_ERROR);
    }
    if((dz->wordstor = (char **)malloc(dz->infilecnt * sizeof(char *)))==NULL) {
        sprintf(errstr,"Cannot store filename.\n");
        return(MEMORY_ERROR);
    }
    p = filename + strlen(filename);
    p--;
    while(p != filename) {
        if(*p == '.') {
            if(strcmp(p,".wav")) {
                sprintf(errstr,"Input file %s is not a soundfile.\n",filename);
                return(DATA_ERROR);
            }
            break;
        }
        p--;
    }
    if(p == filename)
        k = 5;
    else
        k = 1;
    if((dz->wordstor[0] = (char *)malloc((strlen(filename)+1) * sizeof(char)))==NULL) {
        sprintf(errstr,"Cannot store filename.\n");
        return(MEMORY_ERROR);
    }
    if((dz->wordstor[0] = (char *)malloc((strlen(filename)+k) * sizeof(char)))==NULL) {
        sprintf(errstr,"Cannot store further filename.\n");
        return(MEMORY_ERROR);
    }
    strcpy(dz->wordstor[0],filename);
    if(k==5)
        strcat(dz->wordstor[0],".wav");
    dz->all_words++;
    return(FINISHED);
}

/****************************** STORE_THE_FURTHER_FILENAME *********************************/

int store_the_further_filename(int n,char *filename,dataptr dz)
{
    char *p;
    int k;
    p = filename + strlen(filename);
    p--;
    while(p != filename) {
        if(*p == '.') {
            if(strcmp(p,".wav")) {
                sprintf(errstr,"Input file %s is not a soundfile.\n",filename);
                return(DATA_ERROR);
            }
            break;
        }
        p--;
    }
    if(p == filename)
        k = 5;
    else
        k = 1;

    if((dz->wordstor[n] = (char *)malloc((strlen(filename)+k) * sizeof(char)))==NULL) {
        sprintf(errstr,"Cannot store further filename.\n");
        return(MEMORY_ERROR);
    }
    strcpy(dz->wordstor[n],filename);
    if(k==5)
        strcat(dz->wordstor[n],".wav");
    dz->all_words++;
    return(FINISHED);
}

/**************************************** REORIENTDATA *********************************************/

int ReorientData(double *pos, double *time, double *level, int *spkr, dataptr dz)
{
    double  timeoffset, central_pos = 1.5, ddiff, thispos;
    int central_spkr = 1, centre_at_lspkr, diff;
    int totalcnt, n, k, kk, nn;
    if(EVEN(dz->mode))
        centre_at_lspkr = 1;
    else
        centre_at_lspkr = 0;
    totalcnt = (dz->itemcnt * 2) - 1;
    if(totalcnt > dz->ringsize) {
        sprintf(errstr,"Error in calculating array sizes.\n");
        return(PROGRAM_ERROR);
    }
    for(k = totalcnt-1,n = dz->itemcnt-1;n>=0;n--,k--) {    //    Move data to array top
        pos[k]   = pos[n];                                    //    XXXXooo to
        level[k] = level[n];                                //    oooXXXX
        time[k]  = time[n];
    }
    for(k = dz->itemcnt-2,n= dz->itemcnt;k>=0;k--,n++) {    //    Copy in inverse order, round centre item
        pos[k]   = pos[n];    //    But lspkr pairs inverted    //  oooXabc to
        level[k] = level[n];                                //    cbaXabc
        time[k]  = -time[n];                                //    Inverting the times
    }
    timeoffset = -time[0];                                    //    Reset times to start at 0.0
    for(n=0;n < totalcnt;n++)
        time[n] = max(0.0,time[n] + timeoffset);
    for(k = totalcnt-1,n = dz->itemcnt-1;n>=0;n--,k--) {    //    Move lspkr data to array top
        kk = k * 2;
        nn = n * 2;
        spkr[kk++] = spkr[nn++];
        spkr[kk]   = spkr[nn];
    }                                                        //    Now invert lspkrs in approach part of array
    if(dz->mode == CENTRAL) {
        for(k = dz->itemcnt-2,n= dz->itemcnt;k>=0;k--,n++) {    //    IF crossing centre ...
            kk = k * 2;
            nn = n * 2;
            if(spkr[nn] != spkr[nn+1]) {                        //    If on a spkr-pair (i.e. between lspkrs)
                spkr[kk]   = spkr[nn+1];                        //    Invert the pair
                spkr[kk+1] = spkr[nn];
            } else {                                            //    Else (on a single lspkr - i.e. exited lspkr-ring)
                spkr[kk] = spkr[nn] - 4;                        //    Put both signals on the opposite lspkr
                if(spkr[kk] <= 0)
                    spkr[kk] += 8;
                spkr[kk+1] = spkr[kk];
            }
        }
    } else {                                                //    Otherwise
        if(centre_at_lspkr)
            central_spkr = dz->iparam[TRAN_FOCUS];                //    Either Centred at lspkr
        else                                                    //    or
            central_pos = dz->param[TRAN_FOCUS];                //    Centred between left and right lspkr
        for(k = dz->itemcnt-2,n= dz->itemcnt;k>=0;k--,n++) {
            kk = k * 2;                                            //    Copy in inverse order, round centre item
            nn = n * 2;
            if(centre_at_lspkr) {                                //    If centred on a loudspeaker
                diff = spkr[nn] - central_spkr;                    //    Find distance from centre (allowing for wraparound at lspkr 8)
                if(diff > 4)                                    //    e.g. centre at 7, next spkr at 1
                    diff -= 8;                                    //    diff 1-7 = -6 equivalent to step of 2 lspkrs
                spkr[kk] = central_spkr - diff;                    //    Orient lspkrs in opposite sense from centre

            } else {                                            //    If not centred AT a lspkr (but in-between 2)
                ddiff = (double)spkr[nn] - central_pos;            //    Measure distance from centre position
                if(ddiff > 4)
                    ddiff -=  8.0;
                thispos   = central_pos - ddiff;                //    Invert it and
                if(thispos > 0.0)                                //    Get corresponding lspkr
                    spkr[kk] = (int)round(thispos);
                else
                    spkr[kk] = -(int)round(-thispos);
            }
            if(spkr[kk] > 8)                                    //    Adjust fro wrap-around lspkr 8
                spkr[kk] -= 8;
            else if(spkr[kk] < 1)
                spkr[kk] += 8;
            kk++;
            nn++;
            if(centre_at_lspkr) {                                //    Do same for other loudspeaker of pair
                diff = spkr[nn] - central_spkr;
                if(diff > 0)
                    diff -= 8;
                spkr[kk] = central_spkr - diff;
            } else {
                ddiff = (double)spkr[nn] - central_pos;
                if(ddiff > 4)
                    ddiff -=  8.0;
                thispos   = central_pos - ddiff;
                if(thispos > 0.0)
                    spkr[kk] = (int)round(thispos);
                else
                    spkr[kk] = -(int)round(-thispos);
            }
            if(spkr[kk] > 8)
                spkr[kk] -= 8;
            else if(spkr[kk] < 1)
                spkr[kk] += 8;
        }
    }
    dz->itemcnt = totalcnt;                                        //    Remember (new) number of events
    return FINISHED;
}

/**************************************** LEFTWARDS *********************************************/

void leftwards(double *pos, double *time, double *level, int *spkr, dataptr dz)
{
    int  central_pos, temp1, temp2;
    int n, m, nn, mm;
    central_pos = dz->itemcnt/2;
    for(n = central_pos -1,m= central_pos +1;n >= 0;n--,m++) {
        nn = n * 2;
        mm = m * 2;
        temp1 = spkr[nn];
        temp2 = spkr[nn+1];
        spkr[nn]   = spkr[mm];
        spkr[nn+1] = spkr[mm+1];
        spkr[mm]   = temp1;
        spkr[mm+1] = temp2;
    }
    return;
}

/**************************************** GET_POSITION *********************************************/

int get_position(double *thispos,int *spkr1,int *spkr2,double linear_steplen,int n,
                 double *distance_to_centre,double first_quadrant,double second_quadrant,int *on_2nd_pair,int *on_3rd_pair,dataptr dz)
{
    double angle;
    switch(dz->mode) {
    case(GLANCING):
        angle = atan((linear_steplen * (double)n)/(*distance_to_centre));
        if(angle <= first_quadrant)        //    first_quadrant = 45
            *thispos = angle/DEG45;        //
        else {                            //        O-d-|-d-|-d-
            if(!(*on_2nd_pair)) {        //   O    |  O
                *spkr1 = *spkr2;        //      |x
                if(*spkr1 > 8)            //  O    c    O.......
                    (*spkr1) -= 8;        //
                if(++(*spkr2) > 8)        //     O       O
                    (*spkr2) -= 8;        //        O
                *on_2nd_pair = 1;
            }
            *thispos = (angle - first_quadrant)/DEG45;
        }
        break;
    case(EDGEWISE):
        angle = atan((linear_steplen * (double)n)/(*distance_to_centre));
        if(angle <= first_quadrant)                            //    first_quadrant = 22.5
            *thispos = (angle + first_quadrant)/DEG45;        //
        else if(angle <= second_quadrant) {                    //      O---O-------
            if(!(*on_2nd_pair)) {                            //       |
                *spkr1 = *spkr2;                            //  O   |x  O
                if(*spkr1 > 8)                                //      c............
                    (*spkr1) -= 8;                            //    O       O
                if(++(*spkr2) > 8)                            //
                    (*spkr2) -= 8;                            //      O   O
                *on_2nd_pair = 1;
            }
            *thispos = (angle - first_quadrant)/DEG45;
        } else {
            if(!(*on_3rd_pair)) {                            //    second_quadrant = 67.5
                if(++(*spkr1)> 8)
                    (*spkr1) -= 8;
                if(++(*spkr2) > 8)
                    (*spkr2) -= 8;
                *on_3rd_pair = 1;
            }
            *thispos = (angle - second_quadrant)/DEG45;
        }
        break;
    case(CROSSING):
        angle = atan((linear_steplen * (double)n)/(*distance_to_centre));
        if(angle <= first_quadrant)                            //    first_quadrant = 45
            *thispos = (angle + first_quadrant)/DEG90;        //
        else {                                                //        O
            if(!(*on_2nd_pair)) {                            //   O     --O--------
                *spkr1 = *spkr2;                            //      |x
                if(*spkr1 > 8)                                //  O    c    O.......
                    (*spkr1) -= 8;                            //
                if(++(*spkr2) > 8)                            //     O       O
                    (*spkr2) -= 8;                            //        O
                *on_2nd_pair = 1;
            }
            *thispos = (angle - first_quadrant)/DEG45;
        }
        break;
    case(CLOSE):
        angle = atan((linear_steplen * (double)n)/(*distance_to_centre));
        if(angle <= first_quadrant)                            //    first_quadrant = 67.5
            *thispos = (angle + first_quadrant)/DEG135;        //
        else {                                                //      O   O
            if(!(*on_2nd_pair)) {                            //
                *spkr1 = *spkr2;                            //  O   |x--O---------
                if(*spkr1 > 8)                                //      c............
                    (*spkr1) -= 8;                            //    O       O
                if(++(*spkr2)> 8)                            //
                    (*spkr2) -= 8;                            //      O   O
                *on_2nd_pair = 1;
            }
            *thispos = (angle - first_quadrant)/DEG45;
        }
        break;
    case(CENTRAL):
        (*distance_to_centre) += linear_steplen;
        if((*distance_to_centre) > 1.0)    {                    //    i.e. outside lspkr ring
            *spkr1 = *spkr2;                                //    all level is on single lspkr
            *thispos = 1.0;
        } else
            *thispos = *distance_to_centre;
        break;
    }
    if(*thispos > 1.0) {
        sprintf(errstr,"Position calculation error.\n");
        return(PROGRAM_ERROR);
    }
    return FINISHED;
}

/**************************************** CALC_FILTERS *********************************************/

int calc_filters(double *balance,int *spkr,dataptr dz)
{
    int exclude = 0, centre_event = dz->itemcnt/2, central_spkr, no_of_unfiltered, xs, unfiltered_cnt;
    int left_centre, right_centre, centreleft, n, m, k;
    double bal;
    if(dz->process == TRANSITFD) {
        exclude = dz->infilecnt - 4; //    Don't filter the extra pitch-shifting files
        if(exclude > 0)
            exclude += 2;            //    and don't filter the events on either side of this
    }
    switch(dz->mode) {
    case(GLANCING):
        if(exclude > 0) {
            if(ODD(exclude)) {
                left_centre  = centre_event - (exclude/2);
                right_centre = centre_event + (exclude/2);
            } else {
                left_centre  = centre_event - (exclude/2);
                right_centre = centre_event + (exclude/2);
            }
        } else {
            left_centre  = centre_event;
            right_centre = centre_event;
        }
        if(left_centre < 0)
            left_centre = 0;
        if(right_centre >= dz->itemcnt)
            right_centre = dz->itemcnt - 1;
        for(n = left_centre; n <= right_centre; n++)
            balance[n] = 1.0;
        n = right_centre + 1;
        bal = 1.0;
        while(n < dz->itemcnt) {
            bal *= dz->param[TRAN_FBAL];
            balance[n] = bal;
            n++;
        }
        n = left_centre - 1;
        bal = 1.0;
        while(n >= 0) {
            bal *= dz->param[TRAN_FBAL];
            balance[n] = bal;
            n--;
        }
        break;
    case(EDGEWISE):
    case(CROSSING):
    case(CLOSE):
    case(CENTRAL):
        centreleft = centre_event * 2;        //    array-index of left speaker of central event
        m = centreleft;
        central_spkr = spkr[m];                //    Actual left speaker of central event
        while(spkr[m] == central_spkr) {
            m += 2;
            if(m >= dz->itemcnt * 2)
                break;
        }
        m /= 2;                                //    Array-index of balance-array where sound leaves lspkr-ring
        if(exclude > 0) {
            no_of_unfiltered = (m - centre_event) * 2;
            no_of_unfiltered--;                //    Check if room for doppler-shifting sounds
            xs = exclude - no_of_unfiltered;
            if(xs > 0)                        //    and if not, increase span of unfiltered events, if possible
                m = min(dz->itemcnt,m+xs);
        }
        unfiltered_cnt = 0;
        for(n = centre_event;n <= m;n++) {    //    While sound is crossing lspkrs (& not pitch-changing), don't filter
            balance[n] = 1.0;
            unfiltered_cnt++;
        }
        bal = 1.0;
        while(n < dz->itemcnt) {
            bal *= dz->param[TRAN_FBAL];
            balance[n] = bal;
            n++;
        }
        for(k = 1, n = centre_event-1;k < unfiltered_cnt;k++,n--)
            balance[n] = 1.0;
        bal = 1.0;
        while(n >= 0) {
            bal *= dz->param[TRAN_FBAL];
            balance[n] = bal;
            n--;
        }
        break;
    }
    return FINISHED;
}

/**************************************** INSERT_SOUNDS *********************************************/

int insert_sounds(int *snd,dataptr dz)
{
    int doplevents = 0, centre_event = dz->itemcnt/2, sndbas = 0;
    int left_centre, right_centre, n, k, snd1 = 0, snd2 = 0;
    switch(dz->process) {
    case(TRANSITD):
    case(TRANSITFD):
        if(dz->process == TRANSITFD) {
            sndbas = 4;
            snd1 = 0;
            snd2 = 2;
        } else if(dz->process == TRANSITD) {
            sndbas = 2;
            snd1 = 0;
            snd2 = 1;
        }
        doplevents = dz->infilecnt - sndbas; // Number of sounds which gradually-pshift to doplshifted end-sound
        if(doplevents > 0) {
            if(ODD(doplevents)) {
                left_centre  = centre_event - (doplevents/2);
                right_centre = centre_event + (doplevents/2);
            } else {
                left_centre  = centre_event - (doplevents/2);
                right_centre = centre_event + (doplevents/2) - 1;
            }
        } else {
            left_centre  = centre_event;
            right_centre = centre_event - 1;
        }                                    //    Put any gradual dopl-shift srcs in middle porition of motion
        for(n = left_centre,k=0; n <= right_centre; n++,k++) {
            if(n >= 0 && n < dz->itemcnt)
                snd[n] = sndbas + k;
        }                                    //    Assign first (or first of filter-pair) of sounds to approaching path
        n = left_centre - 1;
        while(n >= 0)
            snd[n--] = snd1;
        n = right_centre + 1;                //    Assign second (or 2nd of filter-pair) of sounds to receding path
        while(n < dz->itemcnt)
            snd[n++] = snd2;
        break;
    case(TRANSITS):
    case(TRANSITL):
        for(n = 0;n < dz->itemcnt;n++)
            snd[n] = n;
        break;
    default:
        for(n = 0;n < dz->itemcnt;n++)
            snd[n] = 0;
        break;
    }
    return FINISHED;
}

/****************************** READ_INPUT_SNDFILES_LIST *********************************
 *
 *    Ensure Files are mono
 *  Compare properties (srate and channel-count)
 *    Store channel-cnt and the duration.
 *
 */

int read_input_sndfiles_list(char *filename,dataptr dz)
{
    int exit_status, n;
    char *p, fnam[400];
    infileptr infile_info;
    FILE *fp;
    if((fp = fopen(filename,"r"))==NULL) {
        sprintf(errstr,"Cannot open file %s to read souNdfile names.\n",filename);
        return(DATA_ERROR);
    }
    dz->infilecnt = 0;
    while(fgets(fnam,200,fp)!=NULL) {
        p = fnam;
        while(isspace(*p))
            p++;
        if(*p == ';')                //    Allow comments in file
            continue;
        dz->infilecnt++;
    }
    if(dz->infilecnt <= 0) {
        sprintf(errstr,"No data found in file %s\n",filename);
        return(DATA_ERROR);
    }
    dz->infile->filetype = SNDFILE;
    dz->input_data_type  = MANY_SNDFILES;
    if((exit_status = allocate_the_filespace(dz))<0)
        return(exit_status);
    fseek(fp,0,0);
    n = 0;
    while(fgets(fnam,200,fp)!=NULL) {
        p = fnam;
        while(isspace(*p))
            p++;
        if(*p == ';')                //    Allow comments in file
            continue;
        p = fnam + strlen(fnam);    //    Remove newline character
        p--;
        while(p != fnam) {
            if(*p == '\n') {
                *p = ENDOFSTR;
                break;
            }
            p--;
        }
        if(n == 0) {
            if((exit_status = open_first_infile(fnam,dz))<0)
                return exit_status;
            if((infile_info = (infileptr)malloc(sizeof(struct filedata)))==NULL) {
                sprintf(errstr,"INSUFFICIENT MEMORY for infile structure to test TK data.");
                return(MEMORY_ERROR);
            }
            if((exit_status = cdparse(fnam,infile_info))<0)
                return(exit_status);
            if(infile_info->channels != MONO) {
                sprintf(errstr,"Process only works with mono input files.");
                return(DATA_ERROR);
            }
            dz->infile->srate    = infile_info->srate;
            dz->infile->channels = infile_info->channels;
            dz->duration         = infile_info->duration;
            if((exit_status = store_the_filename(fnam,dz))<0)
                return(exit_status);
        } else {
            if((exit_status = handle_other_infile(n,fnam,dz))<0)
                return exit_status;
            sndcloseEx(dz->ifd[n]);
            dz->ifd[n] = -1;
            if((exit_status = store_the_further_filename(dz->all_words,fnam,dz))<0)
                return(exit_status);
        }
        n++;
    }
    fclose(fp);
    if(dz->ifd[0] >= 0) {
        sndcloseEx(dz->ifd[0]);
        dz->ifd[0] = -1;
    }
    return FINISHED;
}

/************************ ALLOCATE_THE_FILESPACE *********************/

int allocate_the_filespace(dataptr dz)
{
    int n;
    if((dz->ifd = (int *)malloc(dz->infilecnt * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY for infile poniters array.\n");
        return(MEMORY_ERROR);
    }
    if((dz->insams = (int *)malloc(dz->infilecnt * sizeof(int)))==NULL) {
        sprintf(errstr,"INSUFFICIENT MEMORY for infile-sampsize array.\n");
        return(MEMORY_ERROR);
    }
    for(n=0;n<dz->infilecnt;n++) {
        dz->ifd[n]        = -1;
        dz->insams[n]     = 0L;
    }
    return(FINISHED);
}
